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For all straight line equations as the one above, the equation is y=mx+c where: m is the gradient, c is the y-intercept. Thus from the arrangement of the given equation, gradient ...
a + 3b = 12, a = 12 - 3b
3(12-3b) + b = 20
36-9b + b = 20
36-8b = 20
8b = 16
b = 2
2a + 12 = 24
2a = 12
a = 6
x^2 - 8x - 20
(x - 10)(x+2)
(Explanation and helping understanding) Remember the last 2 numbers must multiply to equal the last number in the question and add together to equal the middle nu...
To begin answering this question create a small grid
put 5 on the left hand side and put 2x and -6 seperately at the top of the grid
then you can multiply 5 by 2x to gain 10x and multiply 5 ...
Distance = 4 x 85 = 340km
Average speed = 340 / 5 = 68 km/h
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