Solve the simultaneous equations; 2x + y = 18; x + 3y = 19.
Start by selecting a variable to eliminate from the equations. --> Select x in this case.Take the second equation and multiply by 2. --> 2x + 6y = 38Subtract the first equation from this answer. --> 5y = 20Divide through by 5. --> y = 4Substitute this back into the second equation to solve for x. --> x = 7Substitute both x = 7 and y = 4 into the first equation as a check. --> 2(7) + 4 = 18 --> 14 + 4 = 18. Correct
MA
Related Maths GCSE answers
All answers ▸2476 people are at a football match. The ratio of men to women is 3 : 1. How many more men than women are at the match?
Prove that the square of an odd number is always 1 more than a multiple of 4
If we know that y is directly proportional to x and that when x=1, y=3, then what is the value of x when y=4?
(root18 +root2)sqaured/(root8-2). Give answer in form A(B+rootC) where A,B and C are integers