Make x the subject of the equation: 2x+7=5x
Making x the subject means we must rearrange the equation to get it into the form 'x='First, we need to get all the x's on one side; to do so, we will subtract 2x from each side to give 2x+7-2x=5x-2x. This simplifies to 7=3x.Now we must divide through by 3 on each side as we have 3 lots of x but we are looking to find 1 lot of x; 7/3 =3x/3.This then simplifies to 7/3=x. this is the final answer-unless otherwise stated, students should leave answers as a simplified fraction as this is more accurate that rounding a decimal.
SM
Related Maths GCSE answers
All answers ▸The circle c has equation x^2 + y^2 = 1. The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.
work out 64^2/3
Solve for X and Y: 2y + x = 7; 3y - x = 8
Solve these simultaneous questions: 2y+x =8 and y-2x = -1.