# 1pilihanWhich of the following equations is a linear equation?10 = 2 + x2xy + 3 = 43x − 2 = 7x − 2/4 = 2
# 4pilihanGiven the formula 2x - 3y = z, change x as the subject of the formula.x = (z - 3y) / 2x = 2z + 3yx = z + 3y - xx = (3z + 2y)
# 5pilihanWhich of the following states E as the subject of the formula?V=IRA=πr2A=\pi r^2A=πr2E = mc