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 ▸The angle of elevation to the top of a tree is 63 degrees. Given that the distance to the tree is 15 m and your height is 1.6 m, how tall is the tree?
Solve the simultaneous equations '2X+Y=7' and '3X-Y=8'
Solve x^2 + 10x - 3 = 0
Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?